fix: encode deploy package bytes in chunks

[omerbek]

Summary

Fixes #8.

This replaces the deploy button's String.fromCharCode(...contract.packageBytes) conversion with a chunked uint8ArrayToBase64() helper.

Why

The spread call passes every byte as a separate argument to String.fromCharCode(). For larger compiled .masp packages, that can exceed the JavaScript engine argument limit and throw RangeError: Maximum call stack size exceeded before useDeploy() is called.

Chunking keeps the conversion bounded while preserving the same base64 payload passed to deploy().

Testing

• node -e repro/round-trip for a 200000-byte Uint8Array
• corepack yarn@1.22.22 typecheck
• corepack yarn@1.22.22 build

Note: dependency install required --ignore-engines locally because this machine is on Node 21.6.1 while glob@11.1.0 declares 20 || >=22. Also, corepack yarn@1.22.22 lint currently fails because the repo's lint script calls eslint, but eslint is not installed in package.json devDependencies.